Most of the power stations have 3 ways of charging.
1) Plug into standard household outlet- this is typically the fasted way to charge it
2) Plug into vehicle 12V cigarette lighter- this is usually limited to ~100 w/hr, but that's enough to keep it match the draw from typical loads like 12v fridge, mobile device charging, etc.
3) Connect to solar panel- time to charge is highly dependent on time of year, location, etc.
Power stations are complete solutions, nothing additional is needed, just plug and play. Make sure you get one with a large enough inverter to power your most hungry device. For me, that was a microwave.